Meet Our Doctors

David Buchberger, MD

Manchester, Concord | Radiation Treatment & Oncology

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David Buchberger attended Lehigh University for his undergraduate education where he earned a Bachelor of Arts in Biology with a minor in Religious Studies while playing four years of NCAA Division I College Basketball. After graduation in 2010 David continued his playing career overseas, and in 2015 he earned a Master’s degree in Public Policy and Global Health from Durham University in the United Kingdom. He obtained his medical degree from the University of Cincinnati College of Medicine in 2020 where he was a member of the Alpha Omega Alpha and Gold Humanism Honor Societies.

He completed his residency in Radiation Oncology at the Cleveland Clinic where he served as Chief Resident for the 2023-2024 year. During residency Dr. Buchberger presented research at national conferences, participated in multi-institutional collaborations and data collections, published multiple articles in peer-reviewed journals, and authored numerous book chapters on the use of radiation therapy for the treatment of a variety of cancers. At the Cleveland Clinic he received extensive training in modern radiation techniques including volumetric modulated arc therapy (VMAT), intensity modulated radiation therapy (IMRT), image guided radiation therapy (IGRT), high and low dose rate brachytherapy, stereotactic body radiation therapy (SBRT), and stereotactic radiosurgery (SRS).

Dr. Buchberger joined Radiation Oncology Associates in August 2025. He notes, “Caring for cancer patients is my life’s calling and an immense privilege. My mission is to bring the highest level of care and expertise to the community’s that I serve, working to improve the lives of cancer patients with the modality of radiation.”

Clayton Smith, MD

Manchester, Dover | Radiation Treatment & Oncology

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Dr. Clayton Smith received his Bachelor of Arts in Anthropology with a minor in Pre-Medical Studies from the University of Notre Dame in 2014. He went on to earn his medical degree from Georgetown University School of Medicine in 2019. Between his third and fourth years of medical school, Dr. Smith participated in the Medical Research Scholars Program at the National Institutes of Health (NIH) in Bethesda, Maryland, where he developed a machine learning algorithm for detecting prostate cancer on MRI.

Dr. Smith completed his residency in Radiation Oncology at the University of California, Los Angeles, finishing in June 2024. His research during residency focused on innovative imaging and therapeutic approaches for prostate cancer, including PSMA PET/CT, Lutetium-177-PSMA-617, and MRI-guided radiotherapy. His work was presented at national conferences and published in peer-reviewed medical journals. In recognition of his research, Dr. Smith received the ACRO travel grant to study heavy-ion radiotherapy at the renowned Heidelberg University Ion Therapy Center in Germany.

Throughout his residency, Dr. Smith received extensive training in advanced radiation techniques, including image-guided radiation therapy (IGRT), intensity-modulated radiation therapy (IMRT), stereotactic body radiotherapy (SBRT), stereotactic radiosurgery (SRS), MRI-guided radiotherapy, and brachytherapy.

Dr. Smith joined Radiation Oncology Associates in August 2024. Outside of his clinical practice, he enjoys spending time outdoors with his wife, daughter, and dog. A native of Denver, Colorado, he has a deep love for mountain activities such as skiing and hiking.

Dr. Smith shares, “I am deeply grateful for the opportunity to provide high-quality, compassionate cancer care. The trust my patients place in me is an incredible honor and privilege that I take very seriously.”

Christopher Wright, MD

Burlington, Peabody | Radiation Treatment & Oncology

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Christopher Wright received his Bachelor of Science degree in Biochemistry with a minor in Mathematics from the University of Rochester in 2013 and earned his medical degree from Sidney Kimmel Medical College at Thomas Jefferson University in 2017 with an emphasis in clinical and translational research.

Dr. Wright went on to complete his internal medicine internship and residency in Radiation Oncology at the University of Pennsylvania in 2022. During residency, Dr. Wright was invited to present his research at several national conferences and was published in peer-reviewed medical journals for topics including lymphoma, cancers of the lung, breast and oropharynx, and dietary interventions for cancer patients. Dr. Wright spearheaded an international, multi-institutional consortium dedicated to the study of integrating radiotherapy with novel cellular immunotherapies.

During his residency, he was extensively trained in the use of advanced radiation techniques, such as image-guided radiation therapy (IGRT), intensity-modulated radiation therapy (IMRT), stereotactic body radiotherapy (SBRT), stereotactic radiosurgery (SRS), and proton therapy.

Dr. Wright joined Radiation Oncology Associates in August 2022. He enjoys his time outside of the clinic skiing, golfing and exploring New England with his daughter and golden retriever. “I am deeply humbled by the opportunity to provide compassionate cancer treatment of the highest quality to my community and to carefully navigate our patients through their complex diagnoses and longitudinal cancer care.”

Kristofer Roberts, MD

Concord | Radiation Treatment & Oncology

Kristofer Roberts received a Bachelor of Science degree in Microbiology, Immunology, and Molecular Genetics, and a Bachelor of Arts degree in Scandinavian Languages from the University of California, Los Angeles. He graduated with honors in 2002 and subsequently conducted neuroscience research at the Semel Institute for Neuroscience and Human Behavior at UCLA, where he studied the reward system and Parkinson’s disease. Dr. Roberts matriculated to the David Geffen School of Medicine at UCLA and graduated in 2015. While in medical school, he served in leadership with Operation Mend, an organization focused on the healing and rehabilitation of wounded Veterans.

Dr. Roberts completed his residency training in radiation oncology at the Mayo Clinic in Rochester, Minnesota, where he served as chief resident from 2019-2020. While at Mayo Clinic, Dr. Roberts developed expertise in the most current radiotherapy techniques, including Intensity Modulated Radiation Therapy (IMRT), Stereotactic Body Radiation Therapy (SBRT/SABR), Stereotactic Radiosurgery (SRS), Low and High-dose-rate Brachytherapy, and Intensity Modulated Proton Therapy (IMPT). Upon completion of his residency training, Dr. Roberts received the Christina M. Frechette Award in recognition of his dedication to improving the lives of cancer survivors through clinical care and research.

Dr. Roberts has numerous publications in both neuroscience and radiation oncology, investigating topics such as prostate cancer, breast cancer, and biologic modeling in intensity modulated proton therapy.  As a member of the Symptom Intervention Committee in the Alliance for Clinical Trials in Oncology, he remains actively involved in national prospective multi-institutional clinical trials focused on improving patient care through technology and innovation.

“I find the most rewarding part of being a radiation oncologist is the opportunity to advocate for my patients, ensuring that the treatment they receive reflects leading research and cutting-edge therapies. My goal is to pursue a longer, higher quality, and more fulfilling life for each patient. I feel privileged to be a part of the community I serve.”

Naomi Jiang, MD

Burlington, Lowell | Radiation Treatment & Oncology

Naomi Jiang received her Bachelor of Science degree in Biology with a minor in Biomedical Engineering from Massachusetts Institute of Technology (MIT) in 2011 and earned her medical degree from Washington University in St. Louis in 2015 as a WashU Distinguished Alumni Scholar.

Dr. Jiang went on to complete her internship in Preliminary Medicine at Barnes-Jewish Hospital in St. Louis in 2016 and her residency in Radiation Oncology at University of California, Los Angeles (UCLA) in 2020.  She served as Chief Resident from 2019 – 2020.  During residency, Dr. Jiang’s research interests focused on personalized medicine, and she was involved in clinical research projects in prostate, pancreatic, and head and neck cancer that resulted in several presentations at national conferences and peer-reviewed publications.  In addition, she received the American Radium Society (ARS) Young Oncologist Essay Award in 2019.

During her residency, she was extensively trained in the use of advanced radiation techniques, such as image-guided radiation therapy (IGRT), intensity modulated radiation therapy (IMRT), stereotactic body radiotherapy (SBRT), stereotactic radiosurgery (SRS), and MRI-guided radiotherapy for various disease sites.

Dr. Jiang joined Radiation Oncology Associates in August 2020.  “What drew me to the field of radiation oncology are the continuous technological advances that are used to improve patient care and quality of life.  It is truly an honor, privilege, and humbling experience to work with oncology patients, and it is my primary goal to deliver compassionate care in a multidisciplinary environment.”

Ping Zhou, MD, PhD

Londonderry, Nashua | Radiation Treatment & Oncology

View Dr. Zhou’s Publications Below

Dr. Zhou received her Bachelor of Science degree in Biology from Beijing University and then went to New York, earning a Ph.D. degree in cancer research from Columbia University in 1996. During her Ph.D. research, she studied the molecular mechanisms of cancer and was awarded Fellowships from American Cancer Society and National Foundation for Cancer Research.

Dr. Zhou graduated from Harvard Medical School, cum laude, in 2001. During medical school, she pursued her interest in cancer research at MIT and Dana Farber Cancer Institute, where she won an excellent MD thesis award.

After completing an internship in Medicine at Carney Hospital in Massachusetts, she trained in residency at the Joint Center for Radiation Therapy at Harvard Medical School from 2002 to 2006. During her residency, Dr. Zhou conducted and published clinical research in breast, lymphoma, and prostate cancer, and she trained in the use of latest technologies such as intensity modulated radiation therapy (IMRT), stereotactic radiosurgery and stereotactic radiation therapy.

Dr. Zhou joined Radiation Oncology Associates in 2006 after completing her training. I find it most rewarding in helping cancer patients and their families in the fight against cancer. I feel privileged to share my knowledge and expertise in cancer treatment with my patients here in New Hampshire.

H. Andy Singh, MD

Dover, Portsmouth | Radiation Treatment & Oncology

View Dr. Singh’s Publications Below

Andy Singh received his Bachelor of Science degree in genetics from the University of California, Berkeley, in 1991 with honors. In 1995, he received his medical degree from University of Chicago Pritzker School of Medicine. During medical school, he was active in research for which he won several awards.

Dr. Singh completed an internship in internal medicine at Mount Auburn Hospital in Cambridge, MA. He continued his training in radiation oncology at Memorial Sloan-Kettering Cancer Center, where he was named Chief Resident for 1999-2000. During residency, Dr. Singh developed expertise in three dimensional (3D) conformal radiation therapy, intensity modulated radiation therapy (IMRT) and brachytherapy. After finishing his training, Dr. Singh joined Radiation Oncology Associates in 2000.

“I enjoy practicing medicine in this wonderful community,” Dr. Singh said. “Being in a small community allows me more time to interact with my patients and build lasting relationships with them and their families. The medical community in this area is thriving and I am proud to be a part of a team that delivers excellent care to patients in a comfortable setting.”

Bryan Rowe, MD

Concord | Radiation Treatment & Oncology

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Bryan Rowe studied biology at Wesleyan University, where he received his Bachelor of Arts with honors in 2000. He graduated from the University of Connecticut School of Medicine in 2007 and was granted the Excellence in Medical Studies award.
After completing his internship at Saint Vincent’s Medical Center in 2008, Dr. Rowe trained in radiation oncology at Yale New Haven Hospital, where he served as chief resident from 2011 to 2012. During residency, he gained extensive experience in the most current radiation therapy techniques, including intensity modulated radiotherapy (IMRT), image-guided radiotherapy (IGRT), stereotactic radiotherapy, and brachytherapy. Dr. Rowe also participated in a variety of research projects and published multiple articles on breast cancer and the use of stereotactic radiotherapy for lung cancer. He spent a month at the Mayo Clinic focusing on head and neck cancer and also received specialized training in prostate seed implantation at the Seattle Prostate Institute and Mount Sinai Hospital in New York City. Dr. Rowe joined Radiation Oncology Associates in 2012.

“I feel it is a great privilege to help patients and their families face the challenges of a cancer diagnosis. As part of a multidisciplinary team, I strive to provide the highest quality, individualized cancer care for patients in a comfortable, community setting.”

Vivek Patel, MD, PhD

Lowell, Nashua | Radiation Treatment & Oncology

View Dr. Patel’s Publications Below

Vivek Patel received his Bachelor of Science degree from Cornell University in 2006, where he was awarded honors Magna Cum Laude with Distinction in research. He further pursued his interest in biomedical science at the Weill Medical College of Cornell University, where he investigated novel drug therapies for blood disorders. He earned his M.D. and Ph.D. degrees from the Albert Einstein College of Medicine in 2007, where he achieved grant funding from the National Institutes of Health (NIH) and American Medical Association (AMA) for his work on RNA biology. Dr. Patel was elected to the Alpha Omega Alpha honor society upon his graduation from medical school in 2013.

Dr. Patel completed an internship in Internal Medicine at Mount Sinai Beth Israel Medical Center in New York in 2014. Subsequently, he relocated to Boston to train at the Harvard Radiation Oncology Program (HROP), where he treated patients at the Massachusetts General Hospital, Brigham and Women’s Hospital, Dana Farber Cancer Institute, Beth Israel Deaconess Medical Center, and Boston Children’s Hospital. Dr. Patel gained experience in treating a variety of malignancies including rare cancers of both adults and children using both photon and proton radiotherapy techniques. After the completion of his training, Dr. Patel joined Radiation Oncology Associates in 2018.

“Taking care of the men and women that make our community uniquely great is an honor and privilege that brings meaning to each day in the clinic.”

Etin-Osa Osa, MD

Burlington | Radiation Treatment & Oncology

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Etin-Osa Osa received her Bachelor of Science degree in Biology and Chemistry with highest academic distinction from Howard University in 2005 and earned her medical degree from New York University School of Medicine in 2009.

Dr. Osa went on to complete her internship in General Medicine and residency in Radiation Oncology at New York University (NYU) from 2009 to 2014. During her residency, Dr. Osa was involved in several clinical research projects in breast and central nervous system tumors resulting in several publications and received the New York Roentgen Society Best of ASTRO award in 2012. She served as Chief Resident from 2013-2014.

Dr. Osa has also been active in international cancer care and research. As a premedical student, she was awarded a grant from the National Institutes of Health to complete a basic science research fellowship on hepatocellular carcinoma in Hôpital Paul-Brousse in Paris, France. As a resident at NYU, she received the American Society of Radiation Oncology (ASTRO) Global Health Scholar Grant and has presented her research at several international cancer centers in various locations including Tanzania, South Africa, and Italy. As Chief Resident, she received the award for Excellence in International Cancer Outreach from NYU in 2013.

Dr. Osa joined Radiation Oncology Associates in August 2014. “I am honored to be able to provide compassionate, high quality care in a community setting. I enjoy being able to help my patients in any way possible throughout their treatment course.”

William O’Meara, MD

Lowell | Radiation Treatment & Oncology

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Bill O’Meara received his Bachelor of Arts in English from the University of Notre Dame in 1992 and completed medical training at Tulane University School of Medicine in 1997. While in medical school, he simultaneously obtained a masters degree in public health.

Dr. O’Meara completed an internship in internal medicine in 1998 at the Naval Medical Center in San Diego. From 1998-2002, he served as an active duty Naval medical officer with operational forces. He subsequently went on to specialty training and completed a residency in radiation oncology in 2006 and a fellowship in stereotactic body radiotherapy in 2007, both at Memorial Sloan-Kettering Cancer Center in New York.

After finishing training, Dr. O’Meara returned to active duty as a radiation oncologist at the National Naval Medical Center in Bethesda, Maryland, where he also served as the associate program director for the radiation oncology training program at the National Cancer Institute. Dr. O’Meara separated honorably from the Navy as a Commander and joined Radiation Oncology Associates in 2011. He has earned awards for research, teaching and excellence in patient care.

“Caring for cancer patients is a privilege. My focus with every patient is to apply the rapidly advancing technology of radiation therapy in a thoughtful, humane, and meaningful way.”

Jeffrey Brower, MD, PhD

Dover, Manchester | Radiation Treatment & Oncology

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Jeffrey Brower received his Bachelor of Science degree in Microbiology and Cell Science with a minor in Chemistry from the University of Florida. He then went on to earn his Ph.D. in Molecular Biology, during which time his research led to the discovery of a novel gene responsible for cellular respiration and energy metabolism. During his Ph.D. research, he was awarded the Alumni Fellowship and Medical Guild award for his work in molecular biology. Following the completion of his Ph.D., Dr. Brower matriculated to medical school at the University of Florida, graduating with research honors in 2012.

Dr. Brower completed his training in radiation oncology at the University of Wisconsin, serving as chief resident from 2016 to 2017. During residency, he gained extensive experience in the most current radiation therapy techniques, including intensity modulated radiotherapy (IMRT), Tomotherapy, image-guided radiotherapy, and stereotactic radiotherapy as well as the utilization of MRI-guided radiotherapy. In addition, Dr. Brower received comprehensive training in the utilization of brachytherapy to treat gynecologic malignancies. As a resident, Dr. Brower also participated in clinical research, publishing over 25 peer reviewed manuscripts and presenting his work at national conferences. Dr. Brower has published manuscripts on esophageal, lung, brain, head and neck, prostate, liver, skin and gynecologic cancers as well as brain metastases. After the completion of his training, Dr. Brower joined Radiation Oncology Associates in 2017. He currently serves as Gynecological Editor for Radoncquestions.com, an international online learning resource for radiation oncology physicians and trainees. Dr. Brower also is an active peer reviewer for many journals with the field of radiation oncology and continues to participate in resident education.

“It is a great privilege to care for the patients of New England. Community medicine provides me the opportunity to focus on improving the standards of patient care and ensuring that the highest quality therapy is available to patients closer to home.”

Stephen Harris, MD

Nashua | Radiation Treatment & Oncology

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Stephen Harris graduated with distinction with a degree in biomedical engineering from Purdue University in 2001. He went on to Indiana University School of Medicine in 2005 where he was a member of the Alpha Omega Alpha medical honor society. Dr. Harris stayed in Indianapolis to complete his internship at Indiana University before moving to the University of North Carolina to complete his residency in radiation oncology. While at UNC, Dr. Harris served as chief resident from 2008-2010.

During residency, Dr. Harris received extensive training on conventional external radiotherapy and IMRT as well as radiosurgery and high dose rate (HDR) brachytherapy. Dr. Harris has conducted research on young patients with head and neck cancers as well as written scholarly articles on the management of gastrointestinal cancers, radiation effects on the gastrointestinal tract, and radiosurgical treatment of liver tumors. After finishing training, Dr. Harris joined Radiation Oncology Associates in 2010.

“I chose to pursue a career in radiation oncology because it allows me an opportunity to apply my technical abilities and interests to the care of patients. I am deeply fascinated and, at the same time, humbled by the field of oncology. I consider it a great honor to take part in the lives of cancer patients and enjoy working with teams of talented and caring practitioners to better serve my patients.”

Howard Hsu, MD

Burlington, Peabody | Radiation Treatment & Oncology

View Dr. Hsu’s Publications Below

Howard Hsu received his Bachelor of Science degree in Bioengineering from the University of California Berkeley in 1998. He served as a Peace Corps Volunteer in a rural village of South Africa from 1999-2001, working on education and community health projects. He earned his medical degree from Cornell University Medical College in 2005.

Dr. Hsu served for three years as an intern and resident in General Surgery at Washington University / Barnes-Jewish Hospital from 2005-2008. He subsequently pursued research training in radiation biology at the University of California San Francisco / Lawrence Berkeley National Laboratory.

Dr. Hsu trained in Radiation Oncology at New York University from March 2010 to February 2014. During his residency training, he developed a research interest in comparative effectiveness and health-related quality of life. He served as Chief Resident from 2012-2013. Dr. Hsu joined Radiation Oncology Associates in March 2014.

“It is an honor and privilege to serve my patients. I am committed to providing the highest level of care, with special attention to maintaining my patients’ quality of life.”

Klaudia Hunter, MD

Burlington, Lowell | Radiation Treatment & Oncology

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Klaudia Hunter received Bachelor Degrees with Distinction in both philosophy and biology from the University of Illinois at Chicago in 2001. She then graduated with honors from the University of Illinois Medical School in 2006 after completing the James Scholar Program for Independent Study and playing a leadership role in the Alpha Omega Honors Society.

Dr. Hunter completed her surgical internship at the University of California at San Diego in 2007. She continued in the neurosurgical residency training program at the University of California at San Diego until June 2009 when she chose to leave to pursue a career in radiation oncology. She trained in radiation oncology at the University of Michigan from July 2009 to June 2013 and served as chief resident from April 2012 to April 2013. During her residency, she was also the recipient of the Woodworth Resident Research Award and the RSNA Roentgen Resident Research Award. During this time, she developed expertise in the use of intensity modulated radiation therapy (IMRT) for treating complex head and neck cancers and stereotactic treatments (SRS and SBRT) for the treatment of intracranial and extracranial disease. In May 2013, Dr. Hunter received the American Brachytherapy Society HDR Fellowship to receive additional training in brachytherapy for gynecologic, breast, and prostate cancers.

After finishing her training, Dr. Hunter joined Radiation Oncology Associates in August 2013.

“I love interacting with patients and feel privileged to be able to help them through their cancer journey. My most important job is to make patients feel cared for and listened to.”

Brian R. Knab, MD

Londonderry, Manchester | Radiation Treatment & Oncology

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Brian Knab received a Bachelor of Arts degree in interdisciplinary studies at the University of Virginia in 1997. He graduated from Duke University Medical School in 2002 as a member of the Alpha Omega Alpha medical honor society. While in medical school, he participated in a year-long laboratory research program at the University of California at San Francisco investigating new cancer treatments.

Following medical school, Dr. Knab returned to the University of Virginia to complete an internship in internal medicine. He continued his training in radiation oncology at the University of Chicago Medical Center and served as chief resident from 2005 to 2006. During residency, Dr. Knab received extensive training in the latest radiation therapy techniques including intensity modulated radiotherapy (IMRT), stereotactic radiotherapy, and brachytherapy. Dr. Knab also received additional clinical training at the Royal Marsden cancer hospital in London, England and the Seattle Prostate Institute. During residency, Dr. Knab participated in clinical research investigating the treatment of gastrointestinal and gynecologic cancers, brain tumors, and head and neck cancers. He also performed laboratory research in tumor immunotherapy and radiobiology.

After finishing training, Dr. Knab joined Radiation Oncology Associates in 2007. Dr. Knab now serves as medical director for Elliot Regional Cancer Center in Manchester and Londonderry.

“Cancer treatment is a rapidly advancing medical field and it is exciting to be a part of this ongoing revolution,” Dr. Knab said. “I strive to incorporate the latest advancements and technologies into my medical practice to offer the optimal treatment for each individual. I feel privileged to work in this wonderful community with such talented professionals to help provide state of the art cancer care in a compassionate and caring environment.”

Jeffrey Lemons, MD, MS

Dover, Peabody, Portsmouth | Radiation Treatment & Oncology

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Jeff Lemons earned his Bachelor of Science degree from the University of Michigan in Ann Arbor, MI with a major in Cellular, Molecular, and Developmental Biology and a minor in Spanish. After finishing at Michigan, he was selected for the Intramural Research Training Award through the NIH and participated in a year-long research program at the NIDDK in Bethesda, MD. Afterwards, he matriculated into medical school at Temple University School of Medicine in Philadelphia, PA and graduated in 2013 as a member of the Alpha Omega Alpha Honor Society.

After medical school, Dr. Lemons completed internship at Crozer Chester Medical Center in Upland, PA followed by radiation oncology residency at the University of Chicago where he served as Chief Resident in his final year. During his training, he performed clinical research focusing on combining stereotactic body radiotherapy (SBRT) and immunotherapies as well as the utilization of radiation for oligometastases. Dr. Lemons has presented research at national meetings, published in peer-reviewed journals, and authored and managed clinical trials. To expand the scope of his training, he completed externships at the Northwestern Medicine Chicago Proton Center and The Royal Marsden Hospital in London, England. He attended the ASCO/AACR Methods in Clinical Cancer Research Workshop and earned a Master of Science through the Department of Public Health Sciences while at the University of Chicago.

Dr. Lemons joined Radiation Oncology Associates in 2018 after completing his training. He finds great satisfaction working with a team to provide high-quality and individualized care for his patients and help guide them through a difficult time in their lives.

Arul Mahadevan, MD

Dover, Portsmouth | Radiation Treatment & Oncology

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Arul Mahadevan received his Bachelor of Medicine and Surgery from the University of Madras (Chennai) in 1987 and received his Master of Surgery in Orthopedics from the University of Bombay in 1991. After being awarded Fellowships of the Royal Colleges of Surgeons of Edinburgh and Glasgow, United Kingdom, Dr. Mahadevan moved to the United States to practice medicine.

His interest in cancer care led him to complete residency in radiation oncology at Northwestern University, where he served as chief resident. He has completed advanced fellowship training in brachytherapy at Beth Israel Medical Center in New York and a prostate cancer brachytherapy fellowship at the Seattle Prostate Institute before joining the Cleveland Clinic as an Assistant Professor in Radiation Oncology in 2002.

While at the Cleveland Clinic, Dr. Mahadevan specialized in treating genitourinary malignancies including prostate brachytherapy and image guided radiation therapy (IGRT) and published extensively. He was also the director of clinical research at the Cleveland Clinic Cancer Center. He has an active leadership role in national cancer trials and served as Co-Director of the first International Symposium on Stereotactic Body Radiation Therapy and Stereotactic Radiosurgery.

Since joining Radiation Oncology Associates in 2008, Dr. Mahadevan has further helped us make new radiation technologies available usually only available at major academic centers. He continues to remain active in clinical trials with RTOG and serves on the Government Relations Committee and Education Committee for the American Society of Radiation Oncology. He is also the Medical Director of the Radiation Therapy Training Program of the New Hampshire Technical Institute.

Andrea B. McKee, MD

Burlington, Peabody | Radiation Treatment & Oncology

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Andrea McKee received her Bachelor of Arts degree in biology in 1992 from the University of Pennsylvania with honors. She graduated from Columbia University College of Physicians and Surgeons in 1996. During college and medical school, she participated in laboratory and clinical research prior to continuing with her clinical training.

Dr. McKee stayed in New York City for her internship in internal medicine at Lenox Hill Hospital. She continued her training in radiation oncology at Memorial Sloan-Kettering Cancer Center, where she was named Chief Resident for 2000-2001.

During residency, Dr. McKee researched clinical outcomes in patients with tumors of the prostate, uterus, cervix, and musculoskeletal system. She developed expertise in intensity modulated radiation therapy (IMRT), high dose rate (HDR) brachytherapy and stereotactic radiosurgery. After finishing her training at Memorial Sloan-Kettering Cancer Center, Dr. McKee joined Radiation Oncology Associates in 2001.

Dr. McKee helped establish an HDR brachytherapy program in southern New Hampshire in 2004. With a team of neurosurgeons, oncologists, physicists, radiation therapists and oncology nurses, she developed a stereotactic radiotherapy program at the Elliot Hospital where she served as the medical director and co-director of the Elliot Radiosurgery Center. She now serves as the Chair of the Department of Radiation Oncology at Lahey Clinic in Burlington and Peabody.

“I became a radiation oncologist in order to practice medicine in an area that challenged me both emotionally and intellectually. The technological and therapeutic advances in radiation and medical oncology seen over the past few years have led to impressive and meaningful improvements in overall survival and quality of life for our patients. It is an exciting time for those of us who share in the privilege of caring for patients with cancer.

Su Metcalfe, MD, MPH

Concord, Londonderry | Radiation Treatment & Oncology

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Su Metcalfe received her Bachelor of Arts in Asian Studies from Pomona College in 1996. Following this, she received a Masters of Science in Biology with a focus in Immunology from NYU in 1999 and completed a research fellowship at the National Institutes of Health. She earned a Masters of Public Health degree from Columbia University in 2001. In 2005, she graduated from the University of Vermont College of Medicine.

After her internship in internal medicine at Beth Israel Deaconess Medical Center in Boston, Massachusetts, Dr. Metcalfe completed her radiation oncology training at the University of Rochester Medical Center in 2010. During her residency, she received training in stereotactic radiosurgery, image-guided radiotherapy, and intensity modulated radiation therapy. She participated in clinical research utilizing these techniques, specifically in the treatment of metastatic disease. She also performed laboratory research investigating the role of radiation in inducing tumor-specific immunologic response. Dr. Metcalfe has earned awards for research and excellence in patient care. She joined Radiation Oncology Associates in 2010.

Asa J. Nixon, MD, MPH

Burlington, Peabody | Radiation Treatment & Oncology

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Asa Nixon received his Bachelor of Arts degree from Dartmouth College in 1984. In 1988, he graduated with his medical degree from New York University School of Medicine.

Dr. Nixon completed two years of residency in general surgery at New England Deaconess Hospital in Boston, MA. He continued his training in radiation oncology at the Joint Center for Radiation Therapy (JCRT), Harvard Medical School. During residency, Dr. Nixon completed a fellowship in cancer epidemiology from the Harvard School of Public Health, receiving a Masters in Public Health degree.

After finishing his training, Dr. Nixon joined the medical staff at Beth Israel Deaconess Medical Center, the Dana-Farber Cancer Institute and the JCRT where he was an Assistant Professor of Radiation Oncology at Harvard Medical School and specialized in the treatment of breast cancer and tumors of the head and neck.

Since he joined Radiation Oncology Associates in 1999, Dr. Nixon has worked at our New Hampshire sites in Manchester, Dover and Exeter. He currently works full-time at the Lahey Hospital in Burlington Massachusetts where his clinical interests include lung cancer, brain tumors, breast cancer and colorectal malignancies.